s=input()

if s=='RRR':
    print('3')
elif s=='RRS':
    print('2')
elif s=='SRR':
    print('2')
elif s=='SSS':
    print('0')
else:
    print('1') s=input() s input() input if s=='RRR':
    print('3')
elif s=='RRS':
    print('2')
elif s=='SRR':
    print('2')
elif s=='SSS':
    print('0')
else:
    print('1') s=='RRR' s 'RRR' print('3') print '3' elif s=='RRS':
    print('2') s=='RRS' s 'RRS' print('2') print '2' elif s=='SRR':
    print('2') s=='SRR' s 'SRR' print('2') print '2' elif s=='SSS':
    print('0') s=='SSS' s 'SSS' print('0') print '0' print('1') print '1' s=input() input() s
s=input()

if s=='RRR':
    print('3')
elif s=='RRS':
    print('2')
elif s=='SRR':
    print('2')
elif s=='SSS':
    print('0')
else:
    print('1')